GoFast utilizes a UDP Listener for faster data transfer. There has to be a UDP Server setup that you will be connecting to ... to facilitate the transfer.
Configuration of the GoFast Resource gives you the option to connect to that UDP Listener (just as you would an FTP or SFTP listener). GAMFT uses port 8010 to make that connection as a default. You may utilize a different port if needed. But, keep in mind that you need to configure the GoFast Server and GoFast Client. They both will provide the increased speed and transfer rates needed to see improvements.